Hi Andrew,

On Mar 26, 2010, at 3:26 PM, Andrew Collette wrote:

> Hi,
> 
> Does anyone know if it's possible to read/modify the user block
> associated with an open HDF5 file?

        Yes, this section of the file is not modified by the HDF5 library.  
We've thought about adding some API routines for reading & writing to it, but 
they haven't come to the top of the queue yet.

>  The documentation for
> H5Fget_vfd_handle says not to use the returned handle to modify the
> file... is it safe to do things like seeking and reading?

        Yes, it should be.

                Quincey


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